Science & Mathematics - 28 October 2007

2007-10-28 11:49:30 · 2 answers · asked by yodude 1 in Weather

a. 2sqrt. 3
b. 3 sqrt. 3/2
c. 3 sqrt. 2
d. 2 sqrt. 3/3

2007-10-28 11:49:08 · 3 answers · asked by Anonymous in Mathematics

If you stopped the world spinning and spun it the opposite direction

2007-10-28 11:45:57 · 10 answers · asked by mystic witch 2 in Physics

I'm curious. When it's not got the computer monitor behind it looks like it's vibrating at the same speed no matter what pitch I change it to, but when I look at the string in front of the monitor, it appears to slowly... sort of swim, like a sperm tail would, and it changes at different pitches. Why does a computer monitor do this?

2007-10-28 11:43:52 · 2 answers · asked by Chris 3 in Physics

A traffic flow of 1.440 cars during a 24 hour period is equivalent to a rate of how many cars per minute?
A- 240
B- 120
C- 60
D-24
E-1
please if ur not sure dont answer

2007-10-28 11:42:41 · 7 answers · asked by Anonymous in Mathematics

is it next saturday?

2007-10-28 11:42:33 · 2 answers · asked by Anonymous in Earth Sciences & Geology

I seem to be clueless on almost all of it if any one could possibly do a few from each section it would be of great help to me. Thank you

For each parabola, determine: a)how it opens b)width c)vertex d)axis e)focus f)directrix g)y-int or x-int.
1)2x+6y^2=0
a)left
2)-8y=-x^2
a)up
3)y=-1/3(x-2)^2+7
a)down
4)x=5(y+3)^2-4
a)right
5)y+1=-1/4(x-3)^2
a)down
6)y^2-4x-2y=3
a)right
Write the equation for the parabola with:
7)vertex(0,0); focus(-5,0)

8)vertex:(0,0);directrix; x=-2

9)focus(6,0); y-6

Find the a. center and b. radius of each circle
10) x^2+(y+3)^2=36
(0,0); 6
11)(x+5)^2+(y-2)^2=10
(-5,2); sqr. of 10
12)10x^2+10y^2=70
(0,0);sqr. 7
13)4x^2=4y^2=20x-16y+37=0

Write the equation of a circle with:
14)center:(-2,-1); radius= sqr. of 8
(x+2)^2+(y+1)^2=8
For each ellipse find a) center b)vertices c)co. vertices d)foci
15)49x^2+y ^2=49

16)9x^2+25y^2=225

17)(x+3)^2/25 + (y+2)^2/49=1

18)3x^2+6x+5y^2-20y-13=0

Write the equation of an ellipse with:
19)foci(+or -5, 0) co. vertices (0, +or-2)

20)height 20 width 28 center (0,0)

21)center (0.-2) vertical major axis length 6, minor axis length 2

2007-10-28 11:40:58 · 1 answers · asked by Danielle M 1 in Mathematics

What is a definition for a compound pendulum?
its urgent!!!

2007-10-28 11:34:57 · 2 answers · asked by |Earth| |Air| |Fire| |Water| 2 in Physics

what year will the population be 30 000?

And also, I need help completing the square where 3x^2 - 5 =22 and another question where b^2 +20b = -80 (in this question i need to find out what x and y equal as well)

I have a test coming up and i need help with this!
Thanks! Even help for one question will be greatly appreciated!

2007-10-28 11:31:30 · 2 answers · asked by Anonymous in Mathematics

Calculate the force of gravity on a spacecraft 32000 km (5 earth radii) above the Earth's surface if its mass is 1900 kg.

____________N (toward the earth)

(I can't figure this out! I know I have the right equation but it just isn't working!) Please HELP!

2007-10-28 11:29:43 · 1 answers · asked by hayleym425 2 in Physics

2007-10-28 11:28:08 · 1 answers · asked by lovebird 3 in Mathematics

and leaves at a pressure of 2.82×10^5 Pa. What must the celsius temperature of the compressed air be for there to be no possibility of frost forming in the exhaust ports of the engine? Assume that the expansion is adiabatic. (Note: Frost will form if the moist air is cooled below 0 degrees celsius in the expansion.)

2007-10-28 11:19:09 · 1 answers · asked by Paul C 1 in Physics

1. squared 5x + 10 - 15 = 0
2. squared 2x + 6 + 2 = 0
3. Find the distance between ( -3, -2) and (1,4)

2007-10-28 11:18:49 · 3 answers · asked by texan3715 1 in Mathematics

a. 3, 5, 7
b. 13, 14, 15
c. 15, 36, 39
d. 5, 10, 13

2007-10-28 11:18:36 · 7 answers · asked by Anonymous in Mathematics

Also why is I(-) a better nucleophile than F(-) in protic solvents?

2007-10-28 11:17:11 · 1 answers · asked by Anonymous in Chemistry

explain what an element is and why the periodic table is so important

2007-10-28 11:15:07 · 2 answers · asked by Saran S 1 in Chemistry

Determine the specific heat of a metal.

0.755 J/g°C

1.22 J/g°C

.887 J/g°C

.3820 J/g°C

2007-10-28 11:14:19 · 1 answers · asked by wtimm99 1 in Chemistry

For the reaction, S2O3 (-2) + H2O -> HS ( -) + HSO3, please answer the following:
a) is this a redox reaction?
b) which species is reduced? (be very specific)
c) which species is oxidized? (be very specific)
d) which species is the oxidizing agent? (be very specific)

- Basically, can it be a redox reaction if the same thing is being oxidized and reduced? And if it is, wouldn't Sulfur be the answer for B, C, and D?

2007-10-28 11:13:31 · 1 answers · asked by Anonymous in Chemistry

Take free fall acceleration to be = 9.80 .
A wooden rod of negligible mass and length 75.0 is pivoted about a horizontal axis through its center. A white rat with mass 0.480 clings to one end of the stick, and a mouse with mass 0.200 clings to the other end. The system is released from rest with the rod horizontal.

2007-10-28 11:12:54 · 1 answers · asked by Anonymous in Physics

I just felt that NASA already went to the moon almost 40 years ago. We have sooo many urgent problems that have the survival of the human race at stake on the "Earth" that we need to solve. It just doesn't justify to spend billions and billions more to go exploring on the moon just because China did it!!

2007-10-28 11:05:24 · 2 answers · asked by Anonymous in Astronomy & Space

2007-10-28 11:00:56 · 83 answers · asked by Anonymous in Zoology

Please Help this is urgent!! Anyone know how to prove that? Is it that I just pick a whole bunch of random degrees and say look this is all I have to prove it. please help!!

2007-10-28 10:59:34 · 2 answers · asked by The Optimist 2 in Physics

2007-10-28 10:59:26 · 2 answers · asked by red sox 1 in Agriculture

2007-10-28 10:55:33 · 4 answers · asked by Electra 2 in Astronomy & Space

1. A block of mass m=1.20 kg is stacked on top of a block of mass M=3.20 kg and the two move together on a horizontal surface with a constant acceleration of magnitude a=4.04 m/s^2 pointing to the right under the influence of an external horizontal force of manitude F0=40.3N which is applied to mass M. The coefficient between mass m and mass M is (mu)=0.780. The coefficient of kinetic friction between block m and block M is not given. The coefficient of kinetic friction between block M and the horizontal surface is also not given.

a. What is the magnitude of the force of friction exerted by block M on m?

b. What is the magnitude of the force of friction exerted by the horizontal surface on block M?

Please show your work :)

2007-10-28 10:54:38 · 1 answers · asked by carbonatedcolor 2 in Physics

3 blocks are in contact with each other on a frictionless horizontal surface. A 553 N horizontal force is applied to the block with mass of 3.6 kg.

Block A = 3.6 kg
Block B = 5.8 kg
Block C = 6.8 kg

a) What is the magnitude of the force between the block with mass of 5.8 kg and 6.9 kg? Answer in N.
b) What is the magnitude of the force between the block with mass 3.6 kg and 5.8 kg? Answer in N.

Thank you!!!

2007-10-28 10:53:57 · 1 answers · asked by Melissa 1 in Physics

We all know Hubble is a very powerful telescope, i'm wondering how much powerful ? If we point Hubble toward the moon, could it be able to see a man on the surface ?

Another question, a good earth telescope, i don't a few hundreds bucks, what kind of details can you see on the moon ?

2007-10-28 10:52:23 · 5 answers · asked by Kaynos 5 in Astronomy & Space

GEO CHEMIST DETERMINE ECONOMIC VALUE OF MATERIALS

2007-10-28 10:50:14 · 1 answers · asked by princesse haiti 2 in Engineering

2007-10-28 10:49:37 · 9 answers · asked by Anonymous in Mathematics

2007-10-28 10:49:26 · 4 answers · asked by JitterBug589 3 in Chemistry